body {
    font-family: Arial, Helvetica, sans-serif;
}
header {
    background-color: #222;
    color: white;
    text-align: center;
    padding: 12px;
}
.promo {
    background-image: url(../images/phonebgrd.jpg);
    background-size: 100%;
    opacity: 0.5;
    height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 4em;
    text-shadow: 3px 3px 2px black;
    color: yellow;
}
.descript {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    padding: 20px;
    justify-content: center;
}
.feature {
    flex: 1 1 200px;
    border: 1px solid #ccc;
    padding: 12px;
    border-radius: 8px;
    margin: 15px;
}
.action{
    background-color: green;
    color: white;
    text-align: center;
    padding: 30px;
}
.action button{
    padding: 15px 30px;
    border-radius: 8px;
}
button:hover{
    background-color: aqua;
    font-size: 2.5em;
}